EUKYX-199-4110_G5S2_Instruction_Vol4_E - 第349页
EUKYX 5-1 199-4100 1. Classification of Failure and the Countermeasures 1 . C la s s ifi cati on of F ail ure an d the C oun termea su re s 1 . 1 Cla ssification of Failure The mac hi ne proce sses can be cl a ss ified in…
199-4100
Chapter 5
Troubleshooting on Component Picks and Placement
This chapter describes the scope of troubleshooting on
component picks and placement.
1. Classication of Failure and the Countermeasures
2. Troubleshooting on Pickup Errors
3. Troubleshooting on Placement Errors
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EUKYX
5-1199-4100
1. Classification of Failure and the Countermeasures
1. Classification of Failure and the Countermeasures
1.1 Classification of Failure
The machine processes can be classified into Processes A, B, C, D, and E as shown below.
Refer to “4. Surface Mounting Mechanism” in "Chapter 1 (Vol. 1: Guide)" for the outline of
actions.
Process A : The placement head moves to the feeder base and picks up a component.
Process B : The head moves to the area where the component recognition camera is installed
and a component recognition process is taken there.
Process C : The placement angle is corrected while the head is moving to the PCB
positioning section.
Process D : The component is placed on the PCB.
Process E : The component-placed PCB is discharged.
1
2
3
Feeder Base Section
Component Recognition Camera
PCB Positioning Section
Process A
Process B
Process C
Process D
Process E
F4E1
Based on these processes, failures can be divided roughly into the following two types.
Failure before Component Placement :
This type of failure occurs mainly in Processes A, B, and C.
Failure after Component Placement :
This type of failure occurs mainly at Processes D and E.
Reference
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1.2 Countermeasures against Failure
Failures can further be classified as shown in the table below.
Classification of
Failures
Contents of
Failures
Symptom of Failures
Failure before
Component
Placement
Component Pickup
Error
Components cannot be picked up.
Components are turned vertically.
A recognition error occurs.
Components fall down.
Others
Failure after
Component
Placement
Component
Placement Error
The positional and angular deviation of
component occurs.
Components are turned over and placed.
Some components are missing.
Some components are cracked or nicked.
Others
1.2 Countermeasures against Failure
•
The first helpful hint on countermeasures against failure is to catch precisely what kind of
symptom is produced and how frequently the symptom appears.
• The second helpful hint is to grasp the tendency (environment and condition) of a failure.
Shown below are the concrete items to be checked.
(1) Check if the failure occurs on specific components.
(2) Check if the failure occurs on a specific production lot.
(3) Check if the failure occurs on a specific machine.
(4) Check if the failure occurs at a limited stage.
•
The third helpful hint is to find in which process the failure occurs.
In normal cases, a failure after component placement is found in the final inspection process.
In such a case, it is required to track the failure by checking all processes and specify the
process in which the failure has occurred.
It is very important to grasp a failure symptom precisely on these helpful hints. Precise capture
of a failure symptom makes it possible to track the factor and make a plan to take
countermeasures against the failure.
In the case that the present status is not grasped correctly, the countermeasure for the error
takes time due to the execution of ineffective measures.
In particular, for the errors with low occurrence rate, it is required to collect the data
accurately, estimate the factors based on the data collection results, and take the
countermeasure.